From Killer Mobile Software:
FREE feature reduced version of the industry's first and best Call & SMS Filter (Blacklist) Application. Reject Calls & SMS's and rid yourself of annoying callers, telemarketers, the occasional stalker - even filter Unknown/Private/Withheld numbers. Take advantage of our exclusive Spam DB feature and report Spam Callers and download the most recent Spam list for your country. Our "Lite" verison limits you to 5 numbers on your list, as well as the use of the Spam DB numbers for your country. Just another Killer App by Killer Mobile.